Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.The procedure is very simple. Get the death certificate and legal heir certificate. Start the letter with your introduction and the reason for writing the letter. A letter will be sent to the. Estate of the deceased to note that those funds have been returned and the date of the debit to the account. What do you write in a death notice? I need to write to several organisations including banks, insurance and mortgager company to inform them of my partners death. Enter the 6 letters or numbers shown within the image above.